POLYPROPYLENE BLEND WITH IMPROVED BALANCE BETWEEN SIT AND MELTING POINT

摘要

Polymer composite comprising propylene copolymer composition having a comonomer content in the range of 2.5 to 10 wt.-%, the comonomers are C5 to C12 α-olefins, and a low-crystalline polymer having a melting temperature of below 120° C.,
wherein further said polymer composite has(i) a melting temperature of at least 140° C., and(ii) a heat sealing initiation temperature (SIT) of not more than 110° C.

主权项

1. Polymer composite comprising:
(a) a polypropylene (A) having a comonomer content of below 4.0 wt. %, the comonomers are C5 to C12 α-olefins, (b) a propylene copolymer (B) having a comonomer content of 4.0 to 20.0 wt. %, the comonomers are C5 to C12 α-olefins, and (c) a low-crystalline polymer (C) having a melting temperature of below 120° C., wherein further (i) the weight ratio of the polypropylene (A) to the propylene copolymer (B) is in the range of 20/80 to 80/20, (ii) the polymer composite comprises 5 to 50 wt. % based on the total amount of polymer composite of low-crystatline polymer (C), and (iii) the low-crystalline polymer (C) has a lower crystallinity and/or a lower melting temperature than the polypropylene (A) and the propylene copolymer (B).